How to convert units between gauge and inch, millimeter?

Aluminum Gauge Chart

Gauge NumberInchesMM
70.14433.665
80.12853.264
90.11442.906
100.10192.588
110.090742.305
120.080812.053
140.064081.628
160.050821.291
180.040301.024
200.031960.812
220.025350.644
240.020100.511
260.015940.405
280.012640.321
300.010030.255

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